CVE-2020-5407 Signature Wrapping Vulnerability with spring-security-saml2-service-provider
Attackers can bypass SAML authentication by appending arbitrary assertions to valid responses, allowing unauthorized access in applications using Spring Security SAML.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-5407?
CVE-2020-5407 is a high-severity authentication bypass vulnerability in Spring Security, published on 13 May 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Spring Security versions 5.2.x prior to 5.2.4 and 5.3.x prior to 5.3.2 contain a signature wrapping vulnerability during SAML response validation. When using the spring-security-saml2-service-provider component, a malicious user can carefully modify an otherwise valid SAML response and append an arbitrary assertion that Spring Security will accept as valid.
Weakness: CWE-347
Which versions are affected by CVE-2020-5407?
4 open source packages ship an affected version, including org.springframework.security:spring-security-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.springframework.security:spring-security-core Maven | From 5.2.0 | 5.2.4 |
org.springframework.security:spring-security-core Maven | From 5.2.0 | 5.2.4 |
org.springframework.security:spring-security-core Maven | From 5.3.0 | 5.3.2 |
org.springframework.security:spring-security-core Maven | From 5.3.0 | 5.3.2 |
Products include Pivotal Software Spring Security.
How do I fix CVE-2020-5407?
Upgrade org.springframework.security:spring-security-core to a fixed version for your release line: 5.2.4 or 5.3.2.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2020-5407 being exploited?
There is no known exploitation of CVE-2020-5407 in the wild and no public exploit code.
Other vulnerabilities in Spring Security
Sources
Also known as GHSA-48rw-j489-928m.